The first line of defense of the immune system includes mechanical barriers that prevent organisms from the body. The second line of defense includes processes that help remove or neutralize organisms that have penetrated mechanical barriers. The third line of defense is a complex defense that recognizes and reacts to specific organisms.
Answer:
A is the correct answer
Explanation:
The United states pharmacopoeia - National Formulary is a book of public pharmacopoeial standards . it contains Standards for medicines,dosage forms,drug substances, excipients, medical devices and dietary supplements
